INDEX 



Nucleus reproduction, 28 



reproductive, 18 



structure, 15 



value, 16 



vegetative, 18 



yeasts, 61 

 Number of bacteria, in air, 250 



in butter, 410 



in cream, 410 



in milk, 378 



in sewage, 274, 275 



in soil, 308 



in water, 255 

 Nutriljon of micro6rganisms, 141 



OBLIGATE aerobes, 157 



anaerobes, 157 



parasites, 660 



saprophytes, 660 

 Odors in milk, 264 

 Oidium, 56 



albicans, 496, 725 



lactis, 56, 167, 216, 227, 242, 396, 



429. 437 

 Oleomargarine, cultures for, 416 

 Olive knot, 608 

 Oomycetes, 38 

 Opsonic index, 712 

 Opsonins, 572, 711 



hemo-, 713 



index of, 712 

 Opsonogens, 711 

 Oroya fever, 841 

 Orchids, brown rot, 621 

 Organella, 123 

 Organic acids, as food, 153 



in soil, 319 

 Organic matter, in soil, 300 

 Origin of carbohydrates in soil, 315 



fats in soils, 318 



soil, 354 



waxes in soil, 318 

 Ornithodoros moubata, 845 

 Oscillaria, 108 

 Osmotic pressure, 207 

 Osteomyelitis, 741 



Outlines of plant groups, 12 



of protozoal groups, 13 

 Oxidase, 194, 202, 508 



of vinegar, 194, 200 

 Oxidation, of acetic acid, 168 



alcohol, 155, 167, 168 



of ammonia, 146, 174 



bacteria, 281 



of carbon, 151, 313 



of carbon monoxide, 317 ;, 



of hydrogen, 317 



of hydrogen sulphide, 358 



of hyposulphite, 146 



influence on organisms in water, 

 264 



of methane, 317 



of nitrites, 146, 174, 327, 329 



of nitrogen, 313, 339, 343 



rate in carbon, 313 



in soil, 294 



of sulphur, 172, 174, 281, 359 



in water, 264 

 Oxygen, influence on different species, 



152, 153. 157 

 Ozone, as preservative, 269 

 in water, 269 



PACHYTYLUS migratoroides, 643 

 Parachrome bacteria, 176 

 Parasites, facultative, 129 



obligate, 129 



of uncertain position, 136 

 Parasitic microorganisms, 660 



molds, 47 

 Parasitism, 129 

 Parenchymatous tissues, action of 



microorganisms on, 682 

 Parthenogenesis, 128 

 Pasteurization of beer, 461 



of cream, 461 



economic importance of, 461 



of food, 46 1 



of fruit juices, 461 



of milk, 391 

 Pathogenic bacteria in air, 252 



in butter, 419 



